of course it can be nearly impossible to say a person who has murdered babies and laughed at them has “good” in them. So, what type of good do you think lays in the midst of murderers, or people who have impacted others negatively? Also, what makes something good and something bad?
If you believe humans have the capacity to change, then everyone has the capacity to be a better (or worse) person than they once were, and shouldn’t be defined only by the worst thing they’ve ever done. It’s an open question how societies respond to destructive behavior, which is one way of defining good or bad. Once upon a time, it was commonly accepted worldwide that a nation had the authority to execute people; now that’s relatively rare, though it’s still a legal remedy in some US states. IOW, opinions differ. Here are 800 books at BC Libraries on the topic of capital punishment: bit.ly/bcl-capital-punishment